Four-wave Mixing Effect In Photonic Crystal Fiber And It's Application

Based on fiber four-wave mixing theory and photonic crystal fiber characteristics,we designed the phase-sensitive optical parametric amplifier using a specific photonic crystal fiber as gain medium.This type of optical parametric amplifiers not only retains the advantages of ordinary fiber amplifier,and its bandwidth and gain are larger than ordinary fiber amplifier.Compared to non-phase-sensitive optical parametric amplifier,this phase-sensitive optical parametric amplifier can easily break 3dB quantum noise limit while simultaneously amplifying a plurality of signal wavelengths with ultra-low noise figure.Photonic crystal fiber has the characteristics of high nonlinearity,dispersion and non-controllable single mode,etc.Therefore,not only can be applied to the photonic crystal fiber optical communication systems,but also as a good medium for FWM.By optimizing the design parameters,we can obtain the photonic crystal fiber which have high nonlinear coefficient and appropriate dispersion.We will achieve efficient four-wave mixing effect by using the photonic crystal fiber.Based fiber four-wave mixing and optical parametric amplification theory,through a cascade of non-phase-sensitive optical parametric amplifiers,to achieve a phase-sensitive optical parametric amplification,using specific parameters of the photonic crystal fiber as the amplifier gain medium,not only to improve the parametric gain,but also greatly shortened the length of the fiber optic parametric amplifier,which simplifies the phase-sensitive optical parametric amplification system complexity.In accordance with the two optical parametric amplifier structure proposed to calculate the Runge-Kutta method is based on the optical parametric amplifier numerical simulation analysis,from the results,we can see a cascade of phase-sensitive optical parametric amplifier gain bandwidth of about 100nm,and are within the communication band,compared to conventional non-phase-sensitive optical parametric amplifier whose gain higher(higher than conventional gain 6dB),the most important thing is that the cascade optical parametric amplifier to achieve ultra-low noise figure of 1dB.By theoretical analysis,the special photonic crystal fiber having a high nonlinearity,low dispersion and polarization properties,is used as the gain medium for the phase-sensitive optical parametric amplifier which have the characteristics of ultra-high gain,low noise and high bandwidth in future.Since the amplifier large bandwidth,high gain,low noise,and simple structure and other characteristics,making it ideal for dense wavelength division multiplexing communication systems.